The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
A method is
disclosed which increases the effectiveness
of optical inspection tools that utilize fluorescence to discriminate
between the metallic and prepreg regions of printed circuit boards.
improvement in optical inspection capability is the
development of tools that utilize fluorescence to distinguish between
copper circuitry and the prepreg substrate.
These tools generally
function by scanning the surface of the printed circuit board with a
He-Cd laser beam emitting in the blue to near-UV while simultaneously
monitoring the fluorescence of the excited area. Discrimination
between metal and the prepreg is possible since the prepreg is weakly
fluorescent while the metal is totally non-fluorescent. A method to
further improve the capabilities of such tools is to spike the
prepreg resins with a small quantity (typically 1-100 ppm) of a
highly fluorescent material that absorbs at the He-Cd laser emission
lines. This results in an increased
A variety of
fluorescent compounds are suitable for this
purpose, including, but not limited to, fluorescein, rhodamine,
eosin, coumarins, carbocyanines and styryls.